How do I make a specular surface without reflections?
Gloss is essentially the same thing as specularity.  Glossy means that rays reflect off the surface at the angle of incidence (specular angle), producing a reflection.

From the Wikipedia page:


  Gloss is an optical property of a surface to reflect light in a specular (mirror-like) direction.


By definition, gloss (or specularity) will give you reflections, and thus “gloss without reflections” is a self contradicting statement.  So, short of some compositing tricks as sambler has explained in his answer, it isn't really possible to have gloss without reflections.

The roughness slider simulates miniscule roughness in the surface by scattering rays slightly away from the angle of incidence, giving the matte-like shading.